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From: Andrew Thompson <andy@fud.org.nz>
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Subject: Re: svn commit: r196274 - head/sys/dev/usb
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On 16/08/2009, at 16:13, Andrew Thompson <thompsa@FreeBSD.org> wrote:

> Author: thompsa
> Date: Sun Aug 16 14:13:55 2009
> New Revision: 196274
> URL: http://svn.freebsd.org/changeset/base/196274
>
> Log:
>  Change the usb workers from kernel processes to threads, this is  
> mostly a
>  cosmetic change to reduce cruft in the proc table.
>
> Modified: head/sys/dev/usb/usb_process.c
> === 
> === 
> === 
> =====================================================================
> --- head/sys/dev/usb/usb_process.c    Sun Aug 16 10:25:58 2009     
> (r196273)
> +++ head/sys/dev/usb/usb_process.c    Sun Aug 16 14:13:55 2009     
> (r196274)
> @@ -63,10 +63,12 @@
> #endif
>
> #if (__FreeBSD_version >= 800000)
> +static struct proc *usbproc;
> #define    USB_THREAD_CREATE(f, s, p, ...) \
> -        kproc_create((f), (s), (p), RFHIGHPID, 0, __VA_ARGS__)
> +        kproc_kthread_add((f), (s), &usbproc, (p), RFHIGHPID, \
> +            0, "usb", __VA_ARGS__)

This could also be a nice tidyup for zfs which creates quite a few  
procs.

cheers,
Andrew